CN101571152A - Hydraulic cylinder structure - Google Patents

Abstract

The invention discloses a hydraulic cylinder structure, which comprises a shell and a piston, wherein the piston moves relatively in the shell, a gap is kept between the piston and the shell, the shell divides the interior of the shell into three chambers through a sealing ring, a connecting rod penetrates through the sealing ring to be connected to the piston, the shell is respectively provided with a compressed air interface tube, a water connecting tube and an air extraction connecting tube which are communicated with the chambers, and a stop ring is arranged in the chamber where the piston is located and fixed with the shell. The hydraulic cylinder structure provided by the invention has the advantages of simple structure, no pollution to the external environment, no influence on working performance due to vaporization of water, and good lubricity.

Description

A hydraulic cylinder structure

technical field

The invention relates to the technical field of nuclear reactor engineering, in particular to a hydraulic cylinder structure.

Background technique

The traditional hydraulic system generally uses oil as the working medium, and the hydraulic technology using oil as the medium has been quite mature. Due to special environment and resource requirements, in order to prevent oil and other media from polluting the working environment, oil and other non-water media are not allowed to be used in the drive system. However, in the prior art, water is used as the hydraulic cylinder in the hydraulic drive system as the working medium. Because water does not have lubricity and is easy to vaporize, the piston will generate relatively large friction noise when it is working, and its lubricity is poor.

Contents of the invention

The invention overcomes the deficiencies in the prior art and provides a hydraulic cylinder structure with simple structure, no pollution to the external environment, no influence on work performance due to water vaporization, and good lubricity.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A hydraulic cylinder structure includes a casing and a piston. The piston moves relatively in the casing. The casing divides its interior into three chambers through a sealing ring. The connecting rod passes through the sealing ring and is connected to the piston. The connected compressed air interface pipe, water connection pipe, air suction connection, and the stop ring are placed in the chamber where the piston is located, and are fixed with the shell.

The sealing surfaces of the piston and the stop ring are tapered.

Compared with the prior art, the beneficial effect of the present invention is: the device allows water to leak between the moving and static parts under the action of the three chambers through the cooperation between the piston and the housing, and prevents water from leaking In the environment, it also prevents the vaporization of water and has good lubricity.

Description of drawings

Figure 1 Schematic diagram of hydraulic cylinder structure

1 shell, 2a sealing ring, 2b sealing ring, 3 compressed air interface pipe, 4 pumping chamber, 5a water connecting pipe, 5b water connecting pipe, 6 stop ring, 7 piston, 8 water chamber, 9 connecting rod, 10 pumping Gas connection, 11 compressed air chambers

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The hydraulic cylinder is mainly composed of a casing 1 and a piston 7. The piston 7 moves relatively in the casing 1. The piston 7 and the casing 1 maintain an appropriate gap. The casing 1 divides its interior into three chambers through the sealing rings 2a and 2b. The connecting rod 9 is connected to the piston 7 through the sealing rings 2a and 2b, and the compressed air interface pipe 3, the water connection pipe 5a, the water connection pipe 5b, and the suction connection pipe 10 communicated with each chamber are respectively arranged on the casing 1, and the stop ring 6 is placed on the The water chamber 8 where the piston 7 is located is fixed with the casing 1 . The tapered sealing surface of the piston 7 closely cooperates with the tapered sealing surface of the stop ring 6 to better meet the requirement of no leakage.

The working principle of the device is as follows:

When the device is working, the working medium water is pumped into the water chamber 8 through the water connection pipe 5b under the action of the water pump and compressed air, pushing the piston 7 to move to the left. During the movement of the piston 7, in order to reduce the friction between the piston 7 and the casing 1, the piston 7 and the casing 1 maintain an appropriate gap, and the working medium water in the water chamber 8 will penetrate into the other side of the piston through the gap, and the other side of the piston will The water on the side returns to the low-pressure water tank through the water connection pipe 5a and the pipeline as a backup working medium. During the movement of the piston 7, it is necessary to continuously replenish water into the chamber 8 through the water connecting pipe 5b. When the piston 7 moves to the stop ring 6 in the water chamber 8, the piston 7 stops moving, but in order to maintain the proper thrust, the corresponding pressure should still be maintained in the water chamber 8. This function is that the hydraulic system passes through the water connection pipe. 5b is realized by constantly replenishing water to the water chamber 8.

During the working process of the piston 7, in order to better prevent the working medium from leaking into the working environment and prevent the liquid in the working environment from contaminating the working medium, the inside of the casing 1 is divided into three chambers by the sealing rings 2a and 2b. Room for isolation and recovery of working media. The vacuum pumping system pumps out the water in the pumping chamber 4 through the pumping connection pipe 10, and at the same time blows a certain pressure of compressed air into the compressed air chamber 11 through the compressed air interface pipe 3, so that the air pressure is slightly higher than that in the external environment. The pressure of the liquid to prevent the liquid in the external environment from entering the hydraulic cylinder. The air leaked from the compressed air chamber 11 into the suction chamber 4 is discharged together with the water.

When the piston 7 needs to move in reverse, inject high-pressure water into the water chamber 8 through the water connection pipe 5a, push the piston 7 to move to the right, and realize backflow through the water connection pipe 5b. During the whole process, the working medium water is always in a compressed state , does not produce water vaporization.

The piston 7 and the stop ring 6 are sealed with a tapered surface. When the piston 7 moves to the left end, the tapered sealing surface of the piston 7 and the tapered sealing surface of the stop ring 6 are closely matched to meet the requirement of no leakage and the output force can be realized. The long-term stability ensures that the mechanism meets the force requirements.

During the whole working process, no working medium water will leak into the environmental medium, and no environmental liquid will leak into the working medium, which ensures that no pollution occurs during the working process.

Claims (2)

1. A hydraulic cylinder structure, comprising a shell, a piston, and the piston moves relatively in the shell. It is characterized in that the piston and the shell maintain a gap, and the shell divides its interior into three chambers through a sealing ring, and the connecting rod passes through the sealing ring Connected to the piston, the shell is respectively provided with a compressed air interface pipe, a water connection pipe, and an air suction pipe connected with each chamber, and the stop ring is placed in the chamber where the piston is located, and is fixed with the casing. 2. A hydraulic cylinder structure according to claim 1, characterized in that the sealing surface between the piston and the stop ring is tapered.

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